I spent several hours reading about this. I think in context (from
contemporaneous accounts) they were building several vessels at the same
time, with the net effect of one rolling off the assembly line (assembly
canal?) at roughly one per day in frenzy mode (when Muslim invaders were at
the gates, so to speak).  The 'Turks' avec  le Turban and curved sword,
were the motivational posters of the era, as popular ship sculptures.  I
have photos of several examples from the Maritime Museum of Barcelona
somewhere on my hard drive (can't find them right now though).  After the
successful invasion of Spain (recall the history of the Muslim general who
promptly burned his ships upon reaching Spain, telling his sailors they
would either be victorious, or dead, ie no retreat was possible).
 The population of the continent was rather nervous, if not outright
fearful after the slaughter and enslavement of the Spaniards by the
Musselmani.